Patent GB-617868-A (GB)
Title: Improvements in the treatment of threads, fabrics, sheets and like materials composed of or containing regenerated cellulose
IPC: D06M11/38
Filed: 1944-06-05
Abstract: Threads, fabrics, sheets and like materials consisting wholly or in part of regenerated cellulose are given a linen-like appearance, crisp-hand, decreased shrinkage characteristics and increased tensile strength, by immersing them for a short time in an aqueous solution of sodium zincate that contains an excess of sodium hydroxide over the amount theoretically required to dissolve the zinc present, and that contains 5 to 37 parts of sodium hydroxide for 100 parts of the solution, and then neutralizing the alkalinity of the treated materials by treatment with an acid.  The treated material may be drained, or wrung or dried or, if desired, washed with water before the treatment with an acid.  Treatment with the zincate solution may be effected at room temperature or at a higher or lower temperature. The acid treatment may be effected by dilute sulphuric hydrochloric or acetic acids and a delustred effect may be obtained by treatment with an acid, e.g. oxalic, phosphoric or carbonic acid which yields a precipitate with the zinc compounds.  The regenerated cellulose material may be combined with other textile materials such as cotton, ramie, flax, wool, silk and casein fibres.  To the zincate solution may be added a cellulose ether such as methyl, ethyl or a hydroxy alkyl cellulose, or softening and wetting agents such as sulphated castor oil, the sulphated amide of hydroxy ethylene diamine and the sulphated fatty alcohols, or alkyd resins or other resins in emulsified condition such as glyceryl-phthalates and emulsified acrylic resins, vinyl resin, and phenolic resins, or pigments, fillers and inert material such as iron oxide, chrome pigment, clay, talc and wood-flour. Specification 573,768 is referred to.ALSO:Threads, fabrics, sheets and like materials consisting wholly or in part of regenerated cellulose are given a linen-like appearance, crisp-hand, decreased shrinkage characteristics and increased tensile strength by immersing them for a short time in an aqueous solution of sodium zincate that contains an excess of sodium hydroxide over the amount theoretically required to dissolve the zinc present, and that contains 5 to 37 parts of sodium hydroxide for 100 parts of the solution, and then neutralizing the alkalinity of the treated materials by treatment with an acid.  The treated material may be drained, or wrung, or dried, or, if desired, washed with water before the treatment with an acid.  Treatment with the zincate solution may be effected at room temperature or at a higher or lower temperature.  The acid treatment may be effected by dilute sulphuric, hydrochloric or acetic acids and a delustred effect may be obtained by treatment with an acid, e.g. oxalic, phosphoric or carbonic acid which yields a precipitate with the zinc compound.  The regenerated cellulose material may be combined with other textile materials such as cotton, ramie, flax, wool, silk and casein fibres.  To the zincate solution may be added a cellulose ether such as methyl, ethyl or a hydroxy alkyl cellulose, or softening and wetting agents such as sulphated castor oil, the sulphated amide of hydroxy ethylene diamine and the sulphated fatty alcohols, or alkyd resins or other resins in emulsified condition such as glyceryl-phthalates and emulsified acrylic resins, vinyl resin, and phenolic resins, or pigments, fillers and inert material such as iron oxide, chrome pigment, clay, talc and wood-flour.  Specification 573,768 is referred to.